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McQuay oil filter change

Working on a McQuay centrifugal M# CE063JAP18RDU STYLE# 068368201F ... The oil filter housing seems to be molded into the compressor shell Ther are only two lines leading into the housing ...I close both ,also close both the lines leading from the oil tank and cooler. loosen the oil shell cover and as expected the oil still under pressure foams out. The limited info I can find says the chiller contains a check valve internal to the filter and it should stop the oil foaming and eventually the pressure wil decrease to the point where I can remove the filter. My problem the oil foams out for over ten min.. Anyone ever have the "check valve" fail... Is this normal and is that filter housing open to the compressor and or impeller??

Seeing as this is your first posting, If you want any more help than that, your gonna have to tell us about your self..This is an open forum and any body can get on here and ask for information. We wouldn't want anyone to get hurt or worse.

McQuay does not recommend regular oil filter or oil changes unless an oil analysis shows reason to. Make sure the compressor casting heaters are working, there shouldn't be much refrigerant in there to cause foaming if the casting is up to temp.

Agree, McJunk does not recommend filter changes. Oil analysis is a joke on these. I had one full of water, sample came back as new oil. Had 1 with a ground down impeller, oil came back great. Unless you've got high or low speed wear, the way the sealed oil system is setup, you can get some false reading.

Originally Posted by acrefertech

McQuay does not recommend regular oil filter or oil changes unless an oil analysis shows reason to. Make sure the compressor casting heaters are working, there shouldn't be much refrigerant in there to cause foaming if the casting is up to temp.

That's crazy! I would have to question either how the sample was taken, or even the quality of the lab. We've had to take multiple samples on the same machine because the one of the labs would always come back with inconclusive results.

Agree, McJunk does not recommend filter changes. Oil analysis is a joke on these. I had one full of water, sample came back as new oil. Had 1 with a ground down impeller, oil came back great. Unless you've got high or low speed wear, the way the sealed oil system is setup, you can get some false reading.